Mendeleev’s periodic table was based on the observation that the properties of elements are a periodic function of their atomic masses. This means that if elements are arranged in the increasing order of their atomic masses, then their properties get repeated after regular intervals. For more answerRead more
Mendeleev’s periodic table was based on the observation that the properties of elements are a periodic function of their atomic masses. This means that if elements are arranged in the increasing order of their atomic masses, then their properties get repeated after regular intervals.
K is in group 1. Therefore, the oxide will be K₂O. C is in group 4. Therefore, the oxide will be CO₂. Al is in group 3. Therefore, the oxide will be Al₂O₃. Si is in group 4. Therefore, the oxide will be SiO₂. Ba is in group 2. Therefore, the oxide will be BaO. For more answers visit to website: httpRead more
K is in group 1. Therefore, the oxide will be K₂O.
C is in group 4. Therefore, the oxide will be CO₂.
Al is in group 3. Therefore, the oxide will be Al₂O₃.
Si is in group 4. Therefore, the oxide will be SiO₂.
Ba is in group 2. Therefore, the oxide will be BaO.
Limitations of Newlands’ law of octaves: a) It was not applicable throughout the arrangements. It was applicable up to calcium only. The properties of the elements listed after calcium showed no resemblance to the properties of the elements above them. b) Those elements that were discovered after NeRead more
Limitations of Newlands’ law of octaves:
a) It was not applicable throughout the arrangements. It was applicable up to calcium
only. The properties of the elements listed after calcium showed no resemblance
to the properties of the elements above them.
b) Those elements that were discovered after Newlands’ octaves did not follow the
law of octaves.
c) The position of cobalt and nickel in the group of the elements (F, Cl) of different
properties could not be explained.
d) Placing of iron far away from cobalt and nickel, which have similar properties as
iron, could also not be explained.
Limitation of Dobereiner’s classification: All known elements could not be classified into groups of triads on the basis of their properties. For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-5/
Limitation of Dobereiner’s classification:
All known elements could not be classified into groups of triads on the basis of their
properties.
The element with atomic number 12 has same chemical properties as that of calcium. This is because both of them have same number of valence electrons (2). For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-5/
The element with atomic number 12 has same chemical properties as that of calcium.
This is because both of them have same number of valence electrons (2).
In the modern periodic table, atoms with similar electronic configurations are placed in the same column. In a group, the number of valence electrons remains the same. Elements across a period show an increase in the number of valence electrons. For more answers visit to website: https://www.tiwariaRead more
In the modern periodic table, atoms with similar electronic configurations are placed in the
same column. In a group, the number of valence electrons remains the same. Elements
across a period show an increase in the number of valence electrons.
(a) The atomic number of this element is 17. (b) It would be chemically similar to F(9) with configuration as 2, 7. For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-5/
(a) The atomic number of this element is 17.
(b) It would be chemically similar to F(9) with configuration as 2, 7.
All the elements in the same column as fluorine have the same number of valence electrons (7). Hence, they all have valency equal to 1. For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-5/
All the elements in the same column as fluorine have the same number of valence
electrons (7). Hence, they all have valency equal to 1.
All the elements in the same column as boron have the same number of valence electrons (3). Hence, they all have valency equal to 3. For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-5/
All the elements in the same column as boron have the same number of valence
electrons (3). Hence, they all have valency equal to 3.
What were the criteria used by Mendeleev in creating his Periodic Table?
Mendeleev’s periodic table was based on the observation that the properties of elements are a periodic function of their atomic masses. This means that if elements are arranged in the increasing order of their atomic masses, then their properties get repeated after regular intervals. For more answerRead more
Mendeleev’s periodic table was based on the observation that the properties of elements are a periodic function of their atomic masses. This means that if elements are arranged in the increasing order of their atomic masses, then their properties get repeated after regular intervals.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-5/
Besides gallium, which other elements have since been discovered that were left by Mendeleev in his Periodic Table? (any two)
Scandium and germanium For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-5/
Scandium and germanium
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-5/
Use Mendeleev’s Periodic Table to predict the formulae for the oxides of the following elements: K, C, AI, Si, Ba.
K is in group 1. Therefore, the oxide will be K₂O. C is in group 4. Therefore, the oxide will be CO₂. Al is in group 3. Therefore, the oxide will be Al₂O₃. Si is in group 4. Therefore, the oxide will be SiO₂. Ba is in group 2. Therefore, the oxide will be BaO. For more answers visit to website: httpRead more
K is in group 1. Therefore, the oxide will be K₂O.
C is in group 4. Therefore, the oxide will be CO₂.
Al is in group 3. Therefore, the oxide will be Al₂O₃.
Si is in group 4. Therefore, the oxide will be SiO₂.
Ba is in group 2. Therefore, the oxide will be BaO.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-5/
What were the limitations of Newlands’ Law of Octaves?
Limitations of Newlands’ law of octaves: a) It was not applicable throughout the arrangements. It was applicable up to calcium only. The properties of the elements listed after calcium showed no resemblance to the properties of the elements above them. b) Those elements that were discovered after NeRead more
Limitations of Newlands’ law of octaves:
a) It was not applicable throughout the arrangements. It was applicable up to calcium
only. The properties of the elements listed after calcium showed no resemblance
to the properties of the elements above them.
b) Those elements that were discovered after Newlands’ octaves did not follow the
law of octaves.
c) The position of cobalt and nickel in the group of the elements (F, Cl) of different
properties could not be explained.
d) Placing of iron far away from cobalt and nickel, which have similar properties as
iron, could also not be explained.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-5/
What were the limitations of Döbereiner’s classification?
Limitation of Dobereiner’s classification: All known elements could not be classified into groups of triads on the basis of their properties. For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-5/
Limitation of Dobereiner’s classification:
All known elements could not be classified into groups of triads on the basis of their
properties.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-5/
In the Modern Periodic Table, calcium (atomic number 20) is surrounded by elements with atomic numbers 12, 19, 21 and 38. Which of these have physical and chemical properties resembling calcium?
The element with atomic number 12 has same chemical properties as that of calcium. This is because both of them have same number of valence electrons (2). For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-5/
The element with atomic number 12 has same chemical properties as that of calcium.
This is because both of them have same number of valence electrons (2).
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-5/
How does the electronic configuration of an atom relate to its position in the Modern Periodic Table?
In the modern periodic table, atoms with similar electronic configurations are placed in the same column. In a group, the number of valence electrons remains the same. Elements across a period show an increase in the number of valence electrons. For more answers visit to website: https://www.tiwariaRead more
In the modern periodic table, atoms with similar electronic configurations are placed in the
same column. In a group, the number of valence electrons remains the same. Elements
across a period show an increase in the number of valence electrons.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-5/
An atom has electronic configuration 2, 8, 7. What is the atomic number of this element?
(a) The atomic number of this element is 17. (b) It would be chemically similar to F(9) with configuration as 2, 7. For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-5/
(a) The atomic number of this element is 17.
(b) It would be chemically similar to F(9) with configuration as 2, 7.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-5/
What property do all elements in the same column of the Periodic Table as fluorine have in common?
All the elements in the same column as fluorine have the same number of valence electrons (7). Hence, they all have valency equal to 1. For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-5/
All the elements in the same column as fluorine have the same number of valence
electrons (7). Hence, they all have valency equal to 1.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-5/
What property do all elements in the same column of the Periodic Table as boron have in common ?
All the elements in the same column as boron have the same number of valence electrons (3). Hence, they all have valency equal to 3. For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-5/
All the elements in the same column as boron have the same number of valence
electrons (3). Hence, they all have valency equal to 3.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-5/